Implement a log class in Python.
A log message includes: text, environment, severity and time (passed in as a parameter)
The class should support efficient retrieval of log messages by time and/or severity and/or environment.
After a while of thinking out loud, the interviewer said that retrieving by time is less important/common than the other two.
At the end, the interviewer asked whether a relational database or not would be a better fit, had we wanted to save the log messages on disk, and explain why.

Question

Implement a log class in Python.
A log message includes: text, environment, severity and time (passed in as a parameter)
The class should support efficient retrieval of log messages by time and/or severity and/or environment.
After a while of thinking out loud, the interviewer said that retrieving by time is less important/common than the other two. 
At the end, the interviewer asked whether a relational database or not would be a better fit, had we wanted to save the log messages on disk, and explain why.

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